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Diffstat (limited to 'decoders/usb_signalling/usb_signalling.py')
| -rw-r--r-- | decoders/usb_signalling/usb_signalling.py | 152 |
1 files changed, 0 insertions, 152 deletions
diff --git a/decoders/usb_signalling/usb_signalling.py b/decoders/usb_signalling/usb_signalling.py deleted file mode 100644 index 3272cbf..0000000 --- a/decoders/usb_signalling/usb_signalling.py +++ /dev/null @@ -1,152 +0,0 @@ -## -## This file is part of the sigrok project. -## -## Copyright (C) 2011 Gareth McMullin <gareth@blacksphere.co.nz> -## Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de> -## -## This program is free software; you can redistribute it and/or modify -## it under the terms of the GNU General Public License as published by -## the Free Software Foundation; either version 2 of the License, or -## (at your option) any later version. -## -## This program is distributed in the hope that it will be useful, -## but WITHOUT ANY WARRANTY; without even the implied warranty of -## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -## GNU General Public License for more details. -## -## You should have received a copy of the GNU General Public License -## along with this program; if not, write to the Free Software -## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA -## - -# USB signalling (low-speed and full-speed) protocol decoder - -import sigrokdecode as srd - -# Low-/full-speed symbols (used as states of our state machine, too). -# Note: Low-speed J and K are inverted compared to the full-speed J and K! -symbols_ls = { - # (<dp>, <dm>): <symbol/state> - (0, 0): 'SE0', - (1, 0): 'K', - (0, 1): 'J', - (1, 1): 'SE1', -} -symbols_fs = { - # (<dp>, <dm>): <symbol/state> - (0, 0): 'SE0', - (1, 0): 'J', - (0, 1): 'K', - (1, 1): 'SE1', -} - -class Decoder(srd.Decoder): - api_version = 1 - id = 'usb_signalling' - name = 'USB signalling' - longname = 'Universal Serial Bus (LS/FS) signalling' - desc = 'USB 1.x (low-speed and full-speed) signalling protocol.' - license = 'gplv2+' - inputs = ['logic'] - outputs = ['usb_signalling'] - probes = [ - {'id': 'dp', 'name': 'D+', 'desc': 'USB D+ signal'}, - {'id': 'dm', 'name': 'D-', 'desc': 'USB D- signal'}, - ] - optional_probes = [] - options = { - 'signalling': ['Signalling', 'full-speed'], - } - annotations = [ - ['Text', 'Human-readable text'] - ] - - def __init__(self): - self.sym = 'J' # The "idle" state is J. - self.samplenum = 0 - self.scount = 0 - self.packet = '' - self.syms = [] - self.oldpins = None - - def start(self, metadata): - self.samplerate = metadata['samplerate'] - self.out_proto = self.add(srd.OUTPUT_PROTO, 'usb_signalling') - self.out_ann = self.add(srd.OUTPUT_ANN, 'usb_signalling') - - def report(self): - pass - - def decode(self, ss, es, data): - for (self.samplenum, pins) in data: - - # Note: self.samplenum is the absolute sample number, whereas - # self.scount only counts the number of samples since the - # last change in the D+/D- lines. - self.scount += 1 - - # Ignore identical samples early on (for performance reasons). - if self.oldpins == pins: - continue - self.oldpins, (dp, dm) = pins, pins - - if self.options['signalling'] == 'low-speed': - sym = symbols_ls[dp, dm] - elif self.options['signalling'] == 'full-speed': - sym = symbols_fs[dp, dm] - - self.put(0, 0, self.out_ann, [0, [sym]]) - self.put(0, 0, self.out_proto, ['SYM', sym]) - - # Wait for a symbol change (i.e., change in D+/D- lines). - if sym == self.sym: - continue - - ## # Debug code: - ## self.syms.append(sym + ' ') - ## if len(self.syms) == 16: - ## self.put(0, 0, self.out_ann, [0, [''.join(self.syms)]]) - ## self.syms = [] - # continue - - # How many bits since the last transition? - if self.packet != '' or self.sym != 'J': - if self.options['signalling'] == 'low-speed': - bitrate = 1500000 # 1.5Mb/s (+/- 1.5%) - elif self.options['signalling'] == 'full-speed': - bitrate = 12000000 # 12Mb/s (+/- 0.25%) - bitcount = int((self.scount - 1) * bitrate / self.samplerate) - else: - bitcount = 0 - - if self.sym == 'SE0': - if bitcount == 1: - # End-Of-Packet (EOP) - # self.put(0, 0, self.out_ann, - # [0, [packet_decode(self.packet), self.packet]]) - if self.packet != '': # FIXME? - self.put(0, 0, self.out_ann, [0, ['PACKET: %s' % self.packet]]) - self.put(0, 0, self.out_proto, ['PACKET', self.packet]) - else: - # Longer than EOP, assume reset. - self.put(0, 0, self.out_ann, [0, ['RESET']]) - self.put(0, 0, self.out_proto, ['RESET', None]) - # self.put(0, 0, self.out_ann, [0, [self.packet]]) - self.scount = 0 - self.sym = sym - self.packet = '' - continue - - # Add bits to the packet string. - self.packet += '1' * bitcount - - # Handle bit stuffing. - if bitcount < 6 and sym != 'SE0': - self.packet += '0' - elif bitcount > 6: - self.put(0, 0, self.out_ann, [0, ['BIT STUFF ERROR']]) - self.put(0, 0, self.out_proto, ['BIT STUFF ERROR', None]) - - self.scount = 0 - self.sym = sym - |